I would really like a new freeplay game mode where all the unlocked sources are locked again, and need to be unlocked during the game to be used.

I already asked about this in the sticky thread, but there was never any reply. Is there any chance of seeing this added to the game? It would greatly increase the replay value for people that have already unlocked everything and still want a challenge.

That's a pretty cool gamemode, but I don't think we're going to implement it soon. The code is now structured around achievements that are triggered only at the end of the game, so it would take us a little time to remake it. Right now, we're very busy with our new game, Renowned Explorers.

I'll keep it in mind for if we're going to make more Reus though. ;) It sounds like a great deal of fun to play!